US6271484B1 - Weighing apparatus having an automatic filter adjusting capability - Google Patents

Weighing apparatus having an automatic filter adjusting capability Download PDF

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Publication number
US6271484B1
US6271484B1 US09/166,115 US16611598A US6271484B1 US 6271484 B1 US6271484 B1 US 6271484B1 US 16611598 A US16611598 A US 16611598A US 6271484 B1 US6271484 B1 US 6271484B1
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Prior art keywords
filter
filter characteristic
vibration component
vibration
weight signal
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Expired - Fee Related
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US09/166,115
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English (en)
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Harunori Tokutsu
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Ishida Co Ltd
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Ishida Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/142—Circuits specially adapted therefor
    • G01G3/147—Circuits specially adapted therefor involving digital counting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G23/00—Auxiliary devices for weighing apparatus
    • G01G23/06—Means for damping oscillations, e.g. of weigh beams
    • G01G23/10—Means for damping oscillations, e.g. of weigh beams by electric or magnetic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
    • G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
    • G01G3/1414—Arrangements for correcting or for compensating for unwanted effects

Definitions

  • the present invention generally relates to a weighing apparatus for measuring the weight of articles to be weighed and, more particularly, to the adjustment of a filter used in the weighing apparatus for removing a vibratory component contained in a weight signal.
  • a combination weighing apparatus in which a combination calculation of respective weights of the articles to be weighed which have been supplied into a plurality of weighing hoppers is performed to provide a product having a predetermined weight.
  • this combination weighing apparatus since the natural vibration peculiar to a weighing mechanism itself having an associated weighing hopper and an external vibration brought about mainly by vibration of the floor tend to be imposed as a vibration component on a weight signal outputted from each of the weighing hoppers, the use of a filter (a low-pass filter) in association with each of the weighing hoppers is necessitated to remove the vibration component to secure a weighing accuracy.
  • the frequency of the natural vibration is higher than that of the external vibration.
  • the filter of the kind described above is of a nature that once the filter constant determinative of the filter characteristics (cut-off frequency and/or damping characteristic) is determined, a filter response time can be fixed. In other words, if the capability of damping vibrations is increased by lowering the cut-off frequency, the response time can be increased, but if the capability of damping vibrations is lowered by increasing the cut-off frequency, the response time can be reduced.
  • the filter that can be employed in the weighing apparatus of the kind referred to above is required to be of a type having such a filter characteristic capable of damping the vibration component down to a level which will no longer affect the weighing accuracy and also having a short response time.
  • the solution hitherto taken is to install the weighing apparatus at a site of installation, to conduct a series of tests through trial and error with the filter characteristic being varied while articles to be weighed are actually supplied into the weighing apparatus and finally to select one of filters which has a vibration damping capability effective to secure the weighing accuracy and also having a short filter response time. Accordingly, an adjustment of the filter was a time-consuming work. Since the combination weighing apparatus requires the use of a plurality of weighing mechanisms, adjustment of the filter is required for each of the weighing mechanisms, resulting in extremely timeconsuming and complicated procedures.
  • the present invention has been devised to substantially eliminate the above discussed problems and is intended to provide an improved weighing apparatus having an automatic filter adjusting capability, which is effective to secure a weighing accuracy and wherein the filter characteristic of the filter having a short response time can be adjusted in a short time.
  • one aspect of the present invention provides a weighing apparatus having an automatic filter adjusting capability which comprises a weighing cell for outputting a weight signal indicative of a weight of an article to be weighed which has been loaded thereon, a variable filter having a predetermined filter characteristic, for filtering the weight signal to provide a filtered weight signal, and a filter adjusting device for adjusting the filter characteristic of the variable filter to the predetermined filter characteristic.
  • the filter adjusting device includes a vibration component detecting means for detecting a vibration component from the filtered weight signal, a level setting means for setting a permissible level of the vibration component of the filtered weight signal, a comparator for comparing the vibration component of the filtered weight signal with the permissible level, and a filter characteristic changing means operable based on a result of comparison performed by the comparator to adjust the filter characteristic of the variable filter to allow the vibration component to attain a magnitude approximating to the permissible level, but not exceeding the permissible level.
  • the filter characteristic is automatically adjusted, based on a result of comparison of the vibration component of the filtered weight signal with a permissible level of the vibration components, so that the vibration component of the filtered weight signal can attain a value approximating to the permissible level, but not exceeding the permissible level.
  • the vibration component of the filtered weight signal can attain a value approximating to the permissible level, but not exceeding the permissible level.
  • the present invention according to a second aspect thereof provides a combination weighing apparatus having an automatic filter adjusting capability, which comprises a plurality of weighing cells for outputting respective weight signals indicative of weights of articles to be weighed which have been loaded thereon, a variable filter having a predetermined filter characteristic, for filtering the weight signals to provide corresponding filtered weight signals, a combination calculating means for selecting a combination of the articles to be weighed based on the respective filtered weight signals outputted from the variable filter to thereby calculate the combination which is approximating to a target value within a predetermined allowance, a filter adjusting device for adjusting the filter characteristic of the variable filter to the predetermined filter characteristic.
  • the filter adjusting device used therein includes a vibration component detecting means for detecting a vibration component from each of the filtered weight signals, a level setting means for setting a permissible level of the vibration component of each of the filtered weight signals, a comparator for comparing the vibration component of each of the filtered weight signals with the permissible level, and a filter characteristic changing means operable based on a result of comparison performed by the comparator to adjust the filter characteristic of the variable filter to allow the vibration component to attain a magnitude approximating to the permissible level, but not exceeding the permissible level.
  • the filter characteristic is automatically adjusted, based on a result of comparison of respective vibration components of filtered weight signals with a permissible level of the vibration components, so that the respective vibration components of the filtered weight signals can attain a value approximating to the permissible level, but not exceeding the permissible level.
  • the filter characteristic in which the response time is reduced as short as possible can be obtained quickly in a short time.
  • the present invention furthermore provides, in accordance with a third aspect thereof, a combination weighing apparatus having an automatic filter adjusting capability, which comprises a plurality of weighing cells for outputting respective weight signals indicative of weights of articles to be weighed which have been loaded thereon, a plurality of variable filters each having a predetermined filter characteristic, for filtering the weight signals to provide corresponding filtered weight signals, said variable filters being divided into one or more groups, a combination calculating means for selecting a combination of the articles to be weighed based on the respective filtered weight signals outputted from the respective variable filters to thereby calculate the combination which is approximating to a target value within a predetermined allowance, a filter adjusting device for adjusting the filter characteristic of each of the variable filters to the predetermined filter characteristic.
  • a combination weighing apparatus having an automatic filter adjusting capability, which comprises a plurality of weighing cells for outputting respective weight signals indicative of weights of articles to be weighed which have been loaded thereon, a plurality of variable filters each having a predetermined filter characteristic,
  • the filter adjusting device includes a vibration component detecting means for detecting a vibration component from the filtered weight signal outputted from one or more of the variable filters of each group, a level setting means for setting a permissible level of the vibration component of the filtered weight signal, a comparator for comparing the detected vibration component of the filtered weight signals with the permissible level, and a filter characteristic changing means operable based on a result of comparison performed by the comparator to adjust the respective filter characteristics of all of the variable filters of each group to the same filter characteristic to allow the vibration component to attain a magnitude approximating to the permissible level, but not exceeding the permissible level.
  • the filter characteristic changing means may be so designed as progressively change from the filter characteristic in which a capability of damping vibration is lowest with the shortest response time to the filter characteristic in which the capability of damping the vibration is highest with the longest response time and then to set the filter characteristic exhibited when the vibration component falls within the permissible level.
  • the filter characteristic changing means may be so designed as to progressively change from the filter characteristic in which a capability of damping vibration is highest with the longest response time to the filter characteristic in which the capability of damping the vibration is lowest with the shortest response time and then to set the filter characteristic exhibited immediately before the vibration component has exceeded the permissible level.
  • the filter characteristic changing means can be used to adjust the respective filter characteristics of the variable filters to the same filter characteristic.
  • all of the variable filters can be adjusted to the same filter characteristic to thereby allow any one of the vibration components to be of a value approximating to the permissible level, but not exceeding the permissible level. Even in this case, adjustment of the variable filters can be facilitated accompanying a simplification in structure of the filter adjusting device.
  • FIG. 1 is a circuit block diagram showing a combination weighing apparatus having an automatic filter adjusting capability according to a first preferred embodiment of the present invention
  • FIG. 2 is a schematic side elevational view showing the combination weighing apparatus
  • FIG. 3 is a flowchart showing the sequence of operation of the combination weighing apparatus
  • FIG. 4 is a circuit block diagram showing the combination calculating apparatus having the automatic filter adjusting capability according to a second preferred embodiment of the present invention.
  • FIG. 5 is a circuit block diagram showing the combination weighing apparatus having an automatic filter adjusting capability according to the third preferred embodiment of the present invention.
  • the combination weighing apparatus shown therein comprises a plurality of weighing cells (load cells) 2 - 1 , 2 - 2 , 2 - 3 , . . . 2 -(n- 1 ) and 2 -n for measuring respective weights of articles to be weighed that have been supplied into a plurality of weighing hoppers 28 - 1 , 28 - 2 , 28 - 3 , . . . 28 -(n- 1 ) and 28 -n (See FIG. 2) and also for outputting weight signals W 1 , W 2 , W 3 , . . .
  • W(n- 1 ) and Wn indicative of the respective weights of the articles to be weighed; amplifiers 3 - 1 , 3 - 2 , 3 - 3 , . . . 3 -(n- 1 ) and 3 -n for amplifying the respective weight signals W 1 , W 2 , W 3 , . . . W(n- 1 ) and Wn; analog-to-digital (A/D) converters 4 - 1 , 4 - 2 , 4 - 2 , . . . 4 -(n- 1 ) and 4 -n for sampling the amplified weight signals W 1 , W 2 , W 3 , . . .
  • variable digital filters 6 - 1 , 6 - 2 , 6 - 2 , . . . 6 -(n- 1 ) and 6 -n having respective predetermined filter characteristics and operable to filter the associated digital weight signals W 1 , W 2 , W 3 , . . . W(n- 1 ) and Wn to output corresponding filtered weight signals FW 1 , FW 2 , FW 3 , . . .
  • a combination calculating means 8 for selectively combining the filtered weight signals FW 1 to FWn, for calculating a combination of those filtered weight signals FW 1 to FWn that is approximate to a target value within a predetermined allowance range and for outputting OPEN signals OS for opening respective gates of some or all of the weighing hoppers 28 - 1 , 28 - 2 , 28 - 3 , 28 -(n- 1 ) and 28 -n that have been selected.
  • FIG. 2 A schematic side elevational view of the combination weighing apparatus described above is shown in FIG. 2 .
  • the articles M to be weighed are supplied from a supply conveyor (not shown) onto a dispensing table 22 through a supply chute 21 .
  • the articles M to be weighed which have been supplied onto the dispensing table 22 are dispensed radially outwardly of the dispensing table 22 and are then supplied into pool hoppers 26 - 2 , 26 - 2 , 26 - 3 , . . . 26 -(n- 1 ) and 26 -n through associated radial troughs 24 - 1 , 24 - 2 , 24 - 3 , . . .
  • the articles M to be weighed are pooled temporarily before they are eventually supplied into the weighing hoppers 28 - 1 to 28 -n.
  • the articles M to be weighed so supplied into the weighing hoppers 28 - 1 to 28 -n are weighed by the weighing cells (load cells) 2 - 1 to 2 -n each appended to the corresponding weighing hopper 28 - 1 to 28 -n and are combination-calculated based on the filtered weight signals FW 1 to FWn.
  • some or all of the gates of the weighing hoppers 28 - 1 to 28 -n are opened in response to the associated OPEN signals OS to allow the articles M to be discharged into corresponding collecting chutes 30 .
  • the articles M which have been weighed and discharged into the collecting chutes 30 are subsequently packaged by a packaging machine 32 to provide a bagged product of a weight equal to or substantially equal to the target weight.
  • the combination weighing apparatus shown therein also comprises filter adjusting devices 10 - 1 , 10 - 2 , 10 - 3 , . . . 10 -(n- 1 ) and 10 -n each operable to adjust the filter characteristic of the corresponding variable digital filters 6 - 1 to 6 -n to set it to a predetermined filter characteristic.
  • Each of the filter adjusting devices 10 - 1 to 10 -n includes a vibration component detecting means 12 - 1 , 12 - 2 , 12 - 3 , . . . , 12 -(n- 1 ) to 12 -n for detecting a vibration component U from the respective filtered weight signal FW 1 to FWn.
  • This vibration component detecting means 12 - 1 to 12 -n of each of the filter adjusting devices 10 - 1 to 10 -n is, after the respective weight signal W 1 to Wn have been repeatedly sampled by the associated A/D converter 4 - 1 to 4 -n a predetermined time (fixed time) subsequent to the corresponding weighing hopper 28 - 1 to 18 -n having been filled with the articles M to be weighed, operable to detect the vibration component U in terms of the difference between maximum and minimum values of the respective filtered weight signal FW 1 to FWn obtained at that time.
  • Each of the filter adjusting devices 10 - 1 to 10 -n also includes a level setting means 13 - 1 , 13 - 2 , 13 - 3 , . . . 13 -(n- 1 ) and 13 -n for setting a permissible level US of the vibration component of the respective filtered weight signal FW 1 to FWn, a comparator 14 - 1 , 14 - 2 , 14 - 3 , . . . 14 -(n- 1 ) and 14 -n for comparing the vibration component U of the respective filtered weight signal FW 1 to FWn with the associated permissible level US, and a filter characteristic changing and setting means 16 - 1 , 16 - 2 , 16 - 3 , . .
  • Each of the filter characteristic changing and setting means 16 - 1 to 16 -n includes a filter constant changing means 17 - 1 , 17 - 2 , 17 - 3 , . . . 17 -(n- 1 ) and 17 -n and a filter constant selecting means 18 - 1 , 18 - 2 , 18 - 3 , . . . 18 -(n- 1 ) and 18 -n.
  • the filter constant changing means 17 - 1 to 17 -n is operable to change the filter constant of the corresponding variable digital filter 6 - 1 to 6 -n to progressively vary step-by-step (step down) the filter characteristic from the highest cut-off frequency (the filter characteristic of the lowest vibration damping capability and the shortest response time) down to the lower cut-off frequency (the filter characteristic of the highest vibration damping capability and the longest response time).
  • Change of the filter constant is, where the filtering is carried out by, for example, a known thinning calculation, accomplished by changing the number of thinning. If the number of thinning is small, a strong filter characteristic with a low cut-off frequency can be obtained.
  • the combination weighing apparatus shown in FIG. 1 has an automatic adjusting mode in which the filter adjusting devices 10 - 1 to 10 -n are activated according to change in weighing conditions and/or conditions under which the combination weighing apparatus is installed, to thereby accomplish an automatic adjustment of the variable digital filters.
  • This automatic adjusting mode can be set on by manipulation of a mode switch (not shown). Adjustment is carried out for each of the variable digital filters 6 - 1 to 6 -n associated with the respective weighing cells 2 - 1 to 2 -n, and it is assumed that this adjustment will start with the variable digital filter 6 - 1 .
  • the filter adjusting device 10 - 1 is activated at step S 1 .
  • the variable digital filter 6 - 1 has the filter characteristic set at step S 2 to an initial value which is the filter constant of the highest cut-off frequency (the lowest vibration damping capability and the shortest response time).
  • the articles M to be weighed are subsequently supplied into the associated weighing hopper 28 - 1 at step S 3 to cause the corresponding weighing mechanism to generate a natural vibration.
  • the associated comparator 14 - 1 compares the vibration component U of the filtered weight signal FW 1 , detected by the corresponding vibration component detecting means 12 - 1 , with the permissible level US set by the corresponding level setting means 13 - 1 at step S 4 . It is to be noted that the steps S 3 and S 4 may be executed a plurality of times so that the average value of the vibration components U can be compared.
  • the filter characteristic is stepped at step S 6 by the corresponding filter constant changing means 17 - 1 down to the filter characteristic of a lower cut-off frequency (a higher vibration damping capability and a longer response time) before the program flow returns to step S 3 .
  • the filter characteristic is progressively changed step-by-step, that is, stepped down by repeating the program flow of steps S 3 to S 6 .
  • the filter characteristic of each of the variable digital filters can be so selected that the weighing accuracy can be secured by damping the vibration component U to a value within the permissible level US and the response time is reduced to a value as short as possible by damping the vibration component U to a magnitude most approximating to the permissible level US. Since this series of adjustment is performed automatically, the filter adjustment can be accomplished in a short time.
  • each of the remaining variable digital filters 6 - 2 to 6 -n may have its filter characteristic adjusted to exhibit the same filter characteristic as the variable digital filter 6 - 1 .
  • the natural vibration of each of the weighing mechanisms is unknown.
  • the operation to supply the articles M to be weighed into the corresponding weighing hoppers 28 - 1 to 28 -n to cause the associated weighing mechanism to generate the natural vibration at step S 3 shown in FIG. 3 may be dispensed with so that only the vibration component brought about by an external vibration can be detected by the associated vibration component detecting means 12 - 1 to 12 -n.
  • the frequency of the known natural vibration may be employed as a reference to the cut-off frequency.
  • the respective timings at which the vibration components are detected by the associated vibration component detecting means 12 - 1 to 12 -n are set to the timing at which vibration resulting from the articles M to be weighed that are supplied into the weighing hoppers 28 - 1 to 28 -n is settled down, only the vibration component brought about by the external vibration can be detected without being adversely influenced by the natural vibration regardless of whether the weighing hoppers 28 - 1 to 28 -n in which the articles M to be subsequently weighed are supplied are employed or whether the weighing hoppers 28 - 1 to 28 -n failing to discharge the articles M which have been weighed are employed.
  • the weight signals W 1 to Wn outputted from the respective weighing cells (load cells) 2 - 1 to 2 -n and indicative of the respective weights of the articles M to be weighed are, after having been amplified by the associated amplifier 3 - 1 to 3 -n, supplied to a multiplexer 5 .
  • the weight signals W 1 to Wn are selected one at a time by the multiplexer 5 , that is driven in response to a switching signal c supplied thereto from a switching circuit 7 , and are then supplied to a single analog-to-digital (A/D) converter 4 one by one for conversion into corresponding digital weight signals.
  • A/D analog-to-digital
  • the filtered weight signals FW 1 to FWn are subsequently combined by the combination calculating means 8 for calculation of the combination of those filtered weight signals FW 1 to FWn to select a combined value approximate to the target value within the predetermined allowance range, to thereby output the OPEN signals OS which are in turn supplied to a combination of the selected weighing hoppers 28 - 1 to 28 -n to open the corresponding gates of those selected weighing hoppers 28 - 1 to 28 -n to allow the articles M to be discharged into the associated collecting chutes 30 .
  • Each of the variable digital filters 6 - 1 to 6 -n employed in the combination weighing apparatus according to the second embodiment of the present invention is in the form of a single variable digital filter 6 that functions as a plurality of parallel-connected filters on a time-sharing technique. Also, a single filter adjusting device 10 is employed that is operable to adjust the respective filter characteristics of the variable digital filters 6 - 1 to 6 -n to the same filter characteristic.
  • the respective filter characteristics of the variable digital filters 6 - 1 to 6 -n are changed all at a time to accomplish the filter adjustment.
  • the filter constant of the lowest cut-off frequency is selected as an initial value of the filter characteristic and the cut-off frequency is progressively changed step-by-step (i.e., stepped up) to a higher value
  • the respective vibration components contained in the associated outputs from the variable digital filters 6 - 1 to 6 -n are detected by the corresponding vibration component detecting means 12 - 1 to 12 -n in the filter adjusting device 10 and the detected vibration components are compared by the respective comparators 14 - 1 to 14 -n with the permissible level US set by a single level setting means 13 .
  • the filter characteristic is progressively changed step-by-step, that is, stepped down from that with the highest cut-off frequency to the lower cut-off frequency, the filter characteristic exhibited at the time all of the variable digital filters 6 - 1 to 6 -n have come to exhibit the respective filter characteristics within the permissible level US is employed.
  • the filter characteristic for the variable digital filters 6 - 1 to 6 -n having a short response time while the weighing accuracy is maintained can be adjusted in a short time.
  • a third embodiment of the present invention shown in FIG. 5 is applicable where the weighing and installation conditions of the respective weighing mechanisms remain substantially the same.
  • the combination weighing apparatus according to this third embodiment of the present invention is so designed and so configured that during the adjusting mode, based on the weight signal outputted from only some, for example, only one of the weighing cells, all of the filter characteristics may be fixed and all of the variable digital filters 6 - 1 to 6 -n may then be adjusted to such filter characteristics.
  • the filter characteristic is adjusted step-by-step in a manner similar to that described in connection with the first embodiment of the present invention to determine the filter characteristic with which the filtered weight signal FW 1 falling within the permissible level US can be obtained, and the remaining variable digital filters 6 - 2 to 6 -n are then adjusted to such determined filter characteristic.
  • the filter characteristic for the variable digital filters 6 - 1 to 6 -n having a short response time while the weighing accuracy is maintained can be adjusted in a short time.
  • arrangement may be made that based on the filtered weight signals supplied respectively from two or more of the variable digital filters all of the variable digital filters may be adjusted to the same filter characteristic so that one of the vibration components can be of a value approximating to the permissible level, but not exceeding the permissible level.
  • arrangement may be contemplated in which the weighing heads are divided into a plurality of groups and, based on the filtered weight signal supplied from a portion of, for example, one variable digital filter for each group, all of the variable digital filters of such group can be adjusted to the same filter characteristic by the use of the technique described hereinbefore.
  • variable filters are employed in the form of a variable digital filter, the use of a variable analog filter may be contemplated within the spirit of the present invention.
  • the present invention makes use of the automatic adjusting mode, other than the normal weighing mode, for adjusting the respective filter characteristics of the variable digital filters 6 - 1 to 6 -n
  • the use of the automatic adjusting mode is not always essential and the automatic adjustment of the filter characteristic such as represented by the flow of step S 2 to S 7 shown in FIG. 3 can be accomplished by the utilization of weighing data obtained from some of the weighing hoppers 28 - 1 to 28 -n from which the articles M have not been discharged during the operation of the combination weighing apparatus.
  • the present invention is applicable not only to the combination weighing apparatus herein discussed, but also to an automatic weighing apparatus including a single weighing table on which articles to be weighed are placed, and a weighing cell for measuring the load on the weighing table and for subsequently outputting a weight signal indicative of the weight of the articles to be weighed.
US09/166,115 1997-10-08 1998-10-05 Weighing apparatus having an automatic filter adjusting capability Expired - Fee Related US6271484B1 (en)

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JP9275709A JPH11108751A (ja) 1997-10-08 1997-10-08 フィルタ自動調整機能付き計量装置
JP9-275709 1997-10-08

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EP (1) EP0908706B1 (ja)
JP (1) JPH11108751A (ja)
DE (1) DE69815985T2 (ja)

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EP0908706B1 (en) 2003-07-02
DE69815985T2 (de) 2004-05-27
DE69815985D1 (de) 2003-08-07
JPH11108751A (ja) 1999-04-23
EP0908706A1 (en) 1999-04-14

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